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// file : libbuild2/search.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#include <libbuild2/search.hxx>
#include <libbuild2/scope.hxx>
#include <libbuild2/target.hxx>
#include <libbuild2/filesystem.hxx> // mtime()
#include <libbuild2/prerequisite.hxx>
#include <libbuild2/diagnostics.hxx>
using namespace std;
using namespace butl;
namespace build2
{
const target*
search_existing_target (const prerequisite_key& pk)
{
tracer trace ("search_existing_target");
const target_key& tk (pk.tk);
// Look for an existing target in the prerequisite's scope.
//
dir_path d;
if (tk.dir->absolute ())
d = *tk.dir; // Already normalized.
else
{
d = tk.out->empty () ? pk.scope->out_path () : pk.scope->src_path ();
if (!tk.dir->empty ())
{
d /= *tk.dir;
d.normalize ();
}
}
// Prerequisite's out directory can be one of the following:
//
// empty This means out is undetermined and we simply search for a
// target that is in the out tree which happens to be indicated
// by an empty value, so we can just pass this as is.
//
// absolute This is the "final" value that doesn't require any processing
// and we simply use it as is.
//
// relative The out directory was specified using @-syntax as relative (to
// the prerequisite's scope) and we need to complete it similar
// to how we complete the relative dir above.
//
dir_path o;
if (!tk.out->empty ())
{
if (tk.out->absolute ())
o = *tk.out; // Already normalized.
else
{
o = pk.scope->out_path ();
o /= *tk.out;
o.normalize ();
}
// Drop out if it is the same as src (in-src build).
//
if (o == d)
o.clear ();
}
const target* t (targets.find (*tk.type, d, o, *tk.name, tk.ext, trace));
if (t != nullptr)
l5 ([&]{trace << "existing target " << *t
<< " for prerequisite " << pk;});
return t;
}
const target*
search_existing_file (const prerequisite_key& cpk)
{
tracer trace ("search_existing_file");
const target_key& ctk (cpk.tk);
const scope* s (cpk.scope);
path f;
if (ctk.dir->absolute ())
f = *ctk.dir; // Already normalized.
else
{
f = s->src_path ();
if (!ctk.dir->empty ())
{
f /= *ctk.dir;
f.normalize ();
}
}
// Bail out if not inside project's src_root.
//
if (s == nullptr || !f.sub (s->root_scope ()->src_path ()))
return nullptr;
// Figure out the extension. Pretty similar logic to file::derive_path().
//
optional<string> ext (ctk.ext);
if (!ext)
{
if (auto f = ctk.type->fixed_extension)
ext = f (ctk, s->root_scope ());
else if (auto f = ctk.type->default_extension)
ext = f (ctk, *s, nullptr, true);
if (!ext)
{
// What should we do here, fail or say we didn't find anything?
// Current think is that if the target type couldn't find the default
// extension, then we simply shouldn't search for any existing files
// (of course, if the user specified the extension explicitly, we will
// still do so).
//
l4 ([&]{trace << "no default extension for prerequisite " << cpk;});
return nullptr;
}
}
// Make a copy with the updated extension.
//
const prerequisite_key pk {
cpk.proj, {ctk.type, ctk.dir, ctk.out, ctk.name, ext}, cpk.scope};
const target_key& tk (pk.tk);
// Check if there is a file.
//
f /= *tk.name;
if (!ext->empty ())
{
f += '.';
f += *ext;
}
timestamp mt (mtime (f));
if (mt == timestamp_nonexistent)
{
l4 ([&]{trace << "no existing file for prerequisite " << cpk;});
return nullptr;
}
l5 ([&]{trace << "found existing file " << f << " for prerequisite "
<< cpk;});
dir_path d (f.directory ());
// Calculate the corresponding out. We have the same three options for the
// prerequisite's out directory as in search_existing_target(). If it is
// empty (undetermined), then we need to calculate it since this target
// will be from the src tree.
//
// In the other two cases we use the prerequisite's out (in case it is
// relative, we need to complete it, which is @@ OUT TODO). Note that we
// blindly trust the user's value which can be used for some interesting
// tricks, for example:
//
// ../cxx{foo}@./
//
dir_path out;
if (tk.out->empty ())
{
if (s->out_path () != s->src_path ())
out = out_src (d, *s->root_scope ());
}
else
out = *tk.out;
// Find or insert. Note that we are using our updated extension.
//
auto r (
targets.insert (
*tk.type, move (d), move (out), *tk.name, ext, true, trace));
// Has to be a file_target.
//
const file& t (dynamic_cast<const file&> (r.first));
l5 ([&]{trace << (r.second ? "new" : "existing") << " target " << t
<< " for prerequisite " << cpk;});
t.mtime (mt);
t.path (move (f));
return &t;
}
const target&
create_new_target (const prerequisite_key& pk)
{
tracer trace ("create_new_target");
const target_key& tk (pk.tk);
// We default to the target in this directory scope.
//
dir_path d;
if (tk.dir->absolute ())
d = *tk.dir; // Already normalized.
else
{
d = pk.scope->out_path ();
if (!tk.dir->empty ())
{
d /= *tk.dir;
d.normalize ();
}
}
// Find or insert.
//
// @@ OUT: same story as in search_existing_target() re out.
//
auto r (targets.insert (*tk.type,
move (d),
*tk.out,
*tk.name,
tk.ext,
true /* implied */,
trace));
const target& t (r.first);
l5 ([&]{trace << (r.second ? "new" : "existing") << " target " << t
<< " for prerequisite " << pk;});
return t;
}
}
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